Answer:
Secondary group 
Explanation:
We say that group is a secondary group when we talk about a group of people that gather themselves in an impersonal way. 
Although group members may have some similar interests, the purpose of the group is about the task instead of the relationships, so this group is task-oriented
In this example, although these people met in a sociology class, <u>they see each other only occasionally (they don't have a close relationship) and they gather to study together and pool their notes (they are task-oriented)</u>. 
Thus, sociologists would term them a secondary group. 
 
        
             
        
        
        
I believe the answer is: The presence or absence of music
independent variable refers to the type of variables that are not influenced by other variables. This represent the things that can be controlled by the researchers in order to ignite a certain causal relationship with the dependent variables ( the things they want to measure)
 
        
                    
             
        
        
        
The first one and the second one. Hope this helped! : )
        
             
        
        
        
<span>A sociologist might look at the amount of fresh fruits and vegetables available in a neighborhood trying to understand social issues that affect health. If you can find and afford to live in a neighborhood where you can shop for fresh fruits and vegetables more often, near home, you may be more likely to consume those foods more regularly.</span>